Question

if a wire is bent into the shape of square whose area is 81 cm square when the same wire is bent into asemicicrle shape then find the area of semi circle

Answer 1

Isnt that the same area..that of the square

Answer 2

no it is not same

because it doesn't occupie same space the answer is this

area of square is

a square

then a square=81

if you send square to that side
a=9

half×pirsquare

if you want r

r=a/2

now you find your value